When we stayed at Jambo in June 2009, a CM told us that the animals usually leave the savannas around 9:00 AM and return to their holding areas for a couple hours. The animal keepers use this time to check the status of the animals. Then, around noon, the animals are back on the savannas. Disney purposely picked the 9:00 Am - Noon time frame because guests usually are at the parks in the morning and return to AKL around lunchtime. Even though some animals leave the savanna around that time, there always seemed to be a few animals that adhered to their own schedules. By the way, animals can be seen even at night. There is a night viewing station at Jambo staffed by CMs that have night vision goggles for guests to use. There may be a night viewing area at Kidani, but I don't know for sure. We enjoyed our stay at AKL so much that we added 100 AKV points to our DVC account.